FRITZ!Fon C4 – Service - Knowledge Base
Message "format error"
When you attempt to listen to web radio or podcasts with your FRITZ!Fon, the message "format error" is displayed on the telephone's display and playback fails.
1 Format is not supported
The web radio station or podcast is saved in a format that is not supported by your FRITZ!Fon, for example "wma" or "asf". FRITZ!Fon can only play web radio stations or podcasts that are saved in the playlist format "pls" or "m3u" and refer to an mp3 stream.